CN213574776U

CN213574776U - A rotation axis and air compressor for air compressor

Info

Publication number: CN213574776U
Application number: CN202022167728.7U
Authority: CN
Inventors: 宗伟
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2020-09-28
Filing date: 2020-09-28
Publication date: 2021-06-29
Anticipated expiration: 2030-09-28

Abstract

The utility model provides a rotation axis for air compressor, rotation axis (10) are constructed and are adapted to be connected to the compression part that is used for compressed air and drive the compression part, wherein, rotation axis (10) include body (12) that extend along the axial direction of rotation axis (10) and from body (12) radial outside protruding flange (14), characterized in that, rotation axis (10) are equipped with water conservancy diversion structure (18) in flange (14) department, water conservancy diversion structure (18) are constructed and are adapted to strengthen the gas flow through rotation axis (10). The utility model discloses still relate to an air compressor. With the help of the utility model discloses, can improve the rotation axis and the holistic cooling of air compressor to air compressor.

Description

A rotation axis and air compressor for air compressor

Technical Field

The utility model relates to a rotation axis and an air compressor for air compressor.

Background

The air compressor is widely used in industries such as industry, agriculture, and construction, and is a main body of an air source device, which is a device for converting mechanical energy of a prime mover (usually an electric motor) into gas pressure energy. For example, air compressors may be used in fuel cell systems to provide compressed air to the electrodes of the fuel cell.

Typically, the air compressor operates at relatively high rotational speeds, even up to hundreds of thousands of revolutions per minute. After a long period of high speed operation, the air compressor may generate a large amount of heat, and the temperature of the components of the air compressor increases, which may affect the service life and stability of the air compressor.

Air compressors generally cool various components and gases by means of a water circuit system. However, the water circuit circulation system requires a special pipe to guide the flow of the cooling water, so that the volume of the compressor is increased.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an improved rotation axis and an improved air compressor for air compressor to improve the cooling to rotation axis and air compressor are holistic.

According to a first aspect of the present invention, there is provided a rotary shaft for an air compressor, the rotary shaft being configured to be adapted to be connected to and drive a compression part for compressing air, wherein the rotary shaft comprises a body extending in an axial direction of the rotary shaft and a flange protruding radially outward from the body, wherein the rotary shaft is provided with a flow guiding structure at the flange, the flow guiding structure being configured to be adapted to enhance a gas flow through the rotary shaft.

Herein, unless otherwise specified, "axial" means an axial direction of a rotating shaft, "radial" means a radial direction with respect to the rotating shaft, and "circumferential" means a circumferential direction with respect to the rotating shaft, i.e., a direction surrounding the axial direction of the rotating shaft.

According to an exemplary embodiment of the present invention, the flow guiding structure comprises at least one of the following: at least one gas flow channel formed in the rotating shaft; at least one gas flow channel formed at a surface of the rotating shaft; and a constricted portion of the flange at an outer peripheral edge of the flange, the constricted portion being formed such that a thickness of the flange in the axial direction decreases in a radially outward direction at the constricted portion.

According to an exemplary embodiment of the invention, the gas flow channel comprises at least one of: a first opening and a second opening, wherein the first opening is provided at an outer circumferential surface of the flange, and the second opening is provided at a surface of the body; and a first passage portion and a second passage portion, wherein the first passage portion extends in the body in an axial direction of the rotary shaft, the second passage portion extends in the flange in a radial direction of the rotary shaft, and the first passage portion communicates with the second passage portion and forms an L-shaped gas flow passage.

According to an exemplary embodiment of the invention, the second channel section is located centrally in the flange in the axial direction.

According to an exemplary embodiment of the present invention, the at least one gas flow channel comprises at least two gas flow channels arranged evenly in a circumferential direction of the rotation axis.

According to an exemplary embodiment of the invention, the gas flow channel comprises a first channel portion and a second channel portion, wherein the first channel portion extends at the surface of the body in the axial direction of the rotation axis, the second channel portion extends at the surface of the flange in the radial direction of the rotation axis, the first channel portion communicates with the second channel portion and forms an L-shaped gas flow channel.

According to an exemplary embodiment of the invention, the at least one gas flow channel comprises at least two gas flow channels arranged evenly in the circumferential direction of the rotation axis.

According to an exemplary embodiment of the present invention, the constriction is formed as at least one of: at least partially surrounding the body in a circumferential direction of the rotational axis; narrowing in a radially outward direction at least one of both sides in an axial direction; and a cross-sectional profile having a triangular, trapezoidal, semicircular, semi-elliptical, or involute tooth profile in cross-sections in the axial direction and the radial direction.

According to an exemplary embodiment of the present invention, the rotary shaft is a rotary shaft for a centrifugal air compressor, and the flange is provided adjacent to one end of the rotary shaft connected to an impeller as a compression member.

According to a second aspect of the present invention, an air compressor is provided, wherein the air compressor comprises a compression part for compressing air, a housing for accommodating the compression part and the rotation shaft, and a rotation shaft according to the present invention connected to the compression part and driving the compression part.

The utility model has the advantages of: with the aid of the utility model provides a rotation axis and air compressor can strengthen the gas flow through the rotation axis through the water conservancy diversion structure of flange department for more heat is taken away by gas. This improves cooling of the entire rotary shaft and the air compressor.

Drawings

The principles, features and advantages of the present invention may be better understood by describing the invention in more detail below with reference to the accompanying drawings. The drawings comprise:

fig. 1 schematically shows a cross-sectional view of an air compressor according to an exemplary embodiment of the present invention;

fig. 2 schematically shows a perspective view of a rotating shaft according to an exemplary embodiment of the present invention;

3A-3D show schematic views of a rotating shaft according to an exemplary embodiment of the present invention;

fig. 4 schematically shows a cross-sectional view of a rotating shaft according to an exemplary embodiment of the present invention in an axial direction;

5A-5B illustrate schematic views of a rotating shaft according to an exemplary embodiment of the present invention; and

fig. 6 schematically shows a partial cross-sectional view of a flange of a rotating shaft according to an exemplary embodiment of the present invention.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and a plurality of exemplary embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the scope of the invention.

Fig. 1 schematically shows a cross-sectional view of an air compressor according to an exemplary embodiment of the present invention. The air compressor may be any type of air compressor, and is illustrated herein as a centrifugal air compressor.

As shown in fig. 1, the air compressor may include a compression part for compressing air, a rotation shaft 10 connected to the compression part and driving the compression part, and a housing accommodating the compression part and the rotation shaft 10. The compression member is here an impeller 20 fixed to the rotating shaft 10. The rotating shaft 10 may be rotated by, for example, a motor, and in turn, the impeller 20. The air introduced into the housing is rotated with the impeller 20 and then compressed. The housing may be composed of multiple parts. For example, the housing may include an impeller volute 30, an impeller end cover 40, an adapter plate 50, a casing 60, and a casing end cover 70. An impeller volute 30 and an impeller end cover 40, which constitute an impeller housing in which the impeller 20 can be accommodated, are provided at one end of the casing 60. The other end of the housing 60 is closed by a housing end cap 70. The adapter plate 50 is sealingly connected to the impeller volute 30 and the impeller end cover 40 on one side and to the casing 60 on the other side.

The rotary shaft 10 may include a body 12 extending in an axial direction of the rotary shaft 10 and a flange 14 protruding radially outward from the body 12. The body 12 may be configured to be generally cylindrical. The body 12 may also be provided with a connection structure 16 for connecting an impeller 20, for example. The connecting structure 16 may include a protrusion that is capable of passing through the impeller 20. The connection structure 16 may also include a recess that is capable of mating with a threaded member that passes through the impeller 20. The flange 14 of the rotating shaft 10 may be disposed adjacent to the end of the body 12 to which the impeller 20 is connected. The flange 14 may extend into the space between the impeller end cover 40 and the adapter plate 50. Two thrust bearings may be provided on both axial sides of the flange 14, respectively, to axially restrain the rotary shaft 10.

The rotating shaft 10 is provided with flow directing structures 18 at the flange 14 that enhance the flow of gas through the rotating shaft 10. The gas comprises air or other cooling gas. During operation of the air compressor, a large amount of heat is generated, so that the temperature of parts of the air compressor, such as the rotary shaft, especially, the flange portion of the rotary shaft, is increased. By means of the flow guiding structure 18, the gas flow through the rotating shaft 10 can be increased, thereby facilitating the gas to take more heat away from the rotating shaft 10 or other components for improved cooling. Further, the flow of air within the air compressor can be enhanced, which facilitates cooling other components of the air compressor.

In the exemplary embodiment shown in fig. 1, the flow directing structure 18 includes at least one gas flow channel 182 (see fig. 3A-3D) formed within the rotating shaft 10. Gas may flow through the rotating shaft 10 via the gas flow channel 182 and carry away heat. The flow of gas through the rotating shaft 10 can be efficiently enhanced by the gas flow channel 182 formed in the rotating shaft 10, thereby improving cooling of the rotating shaft 10. In addition, during operation, the rotating shaft 10 may be slightly displaced in the axial direction due to the axial force, such that the flange 14 moves, for example, towards the adapter plate 50 or the impeller end cover 40. This may affect the airflow passing between the flange 14 and the respective adaptor plate 50 or impeller end cover 40. The gas can efficiently flow through the rotary shaft 10 via the gas flow passage 182 formed in the rotary shaft 10 regardless of the axial position of the rotary shaft 10.

Fig. 2 schematically shows a perspective view of a rotating shaft 10 according to an exemplary embodiment of the present invention. Fig. 3A to 3D show a plurality of schematic views of the rotary shaft 10 according to the exemplary embodiment, in which fig. 3A shows a front view of the rotary shaft 10, fig. 3B shows a left side view of the rotary shaft 10, fig. 3C shows a cross-sectional view of the rotary shaft 10 in the axial direction, and fig. 3D shows a cross-sectional view of the rotary shaft 10 along a line D-D in fig. 3A. As shown in fig. 2 and fig. 3A to 3D, the first opening 182c of the gas flow passage 182 is provided at the outer peripheral surface of the flange 14, and the second opening 182D of the gas flow passage 182 is provided at the surface of the body 12, particularly at the end surface of the body 12 facing the impeller 20. The gas flow passage 182 may extend from the first opening 182c to the second opening 182d in the rotating shaft 10 in various forms. Through the first and

second openings

182c and 182d, the gas flow passage 182 opens to a first space S1 located radially outward of the flange 14 and a second space S2 located immediately adjacent to the axial end of the body 12, respectively. The first space S1 may be defined by the impeller cover 40, the rotation shaft 10, and the adapter plate 50, and the second space S2 may be defined by the impeller cover 40, the impeller 20, and the rotation shaft 10. Thus, the flow of gas between the first space S1 and the second space S2 may be enhanced by the gas flow passage 182. For example, the first space S1 and the second space S2 may communicate with the outside through a gas path provided within the case. The gas path may be provided, for example, within the impeller end cover 40, the adapter plate 50, or the casing 60.

As shown in fig. 3C and 3D, the gas flow passage 182 may include a first passage portion 182a and a second passage portion 182b, wherein the first passage portion 182a extends in the body 12 in the axial direction of the rotary shaft 10, the second passage portion 182b extends in the flange 14 in the radial direction of the rotary shaft 10, and the first passage portion 182a communicates with the second passage portion 182b and forms an L-shaped gas flow passage 182. It should be understood that the gas flow passage 182 may take other forms as well. For example, the gas flow channel 182 may extend along a curved path within the rotating shaft 10.

The second channel section 182b can be positioned in particular centrally in the flange 14 in the axial direction, so that a uniform cooling is facilitated.

The at least one gas flow passage 182 may include at least two, for example, four gas flow passages 182 arranged uniformly in the circumferential direction of the rotary shaft 10. This facilitates efficient and uniform cooling.

Fig. 4 schematically shows a cross-sectional view of the rotating shaft 10 in an axial direction according to an exemplary embodiment of the present invention. In this embodiment, the flow directing structure 18 includes at least one gas flow channel 184 formed at the surface of the rotating shaft 10. Thereby, a flow guiding structure 18 may be provided which facilitates processing.

The gas flow channel 184 may open into a first space S1 radially outward of the flange 14 and a second space S2 proximate an axial end of the body 12 similar to the gas flow passage 182. Thus, the flow of gas between the first space S1 and the second space S2 may be enhanced by the gas flow channel 184.

The gas flow channel 184 may include a first channel portion 184a and a second channel portion 184b, wherein the first channel portion 184a extends at the surface of the body 12 in the axial direction of the rotating shaft 10, the second channel portion 184b extends at the surface of the flange 14 in the radial direction of the rotating shaft 10, and the first channel portion 184a communicates with the second channel portion 184b and forms an L-shaped gas flow channel 184.

The at least one gas flow channel 184 may include at least two, for example, four gas flow channels 184 arranged uniformly in the circumferential direction of the rotating shaft 10. This facilitates efficient and uniform cooling.

Fig. 5A schematically shows a front view of the rotary shaft 10 according to an exemplary embodiment of the present invention, and fig. 5B schematically shows a cross-sectional view of the rotary shaft 10 according to this exemplary embodiment in the axial direction. In this embodiment, the flow directing structure 18 includes a constriction 186 of the flange 14 at the outer circumferential edge of the flange 14, the constriction 186 being formed such that the thickness of the flange 14 in the axial direction decreases in the radially outward direction at the constriction 186. The gas may flow into and out of the first space S1, for example, via thrust bearings located on both sides of the flange 14. The resistance of the flange 14 to gas flow may be reduced by the constriction 186, thereby enhancing gas flow around the flange 14. In addition, the narrowed portion 186 can increase the heat radiation area of the flange 14, thereby improving cooling of the rotary shaft 10.

Fig. 6 schematically shows a partial cross-sectional view of the flange 14 of the rotating shaft 10 according to an exemplary embodiment of the present invention. As shown in fig. 6, the flange 14 having the constriction 186 has less resistance to gas flow than the flange 14 without the constriction 186 (shown in phantom), thereby better directing gas flow past the flange 14. It should be understood that the directions of the arrows in fig. 6 are exemplary and not limiting to the gas flow direction.

The constriction 186 can be formed at least partially around the body 12 in the circumferential direction, in particular can be formed around a complete revolution in the circumferential direction.

For example, the narrowed portion 186 may be formed to be narrowed in a radially outward direction at least one of both sides in the axial direction. The constriction 186 can, for example, be formed so as to constrict in the radially outward direction only at the side facing the impeller 20, while extending always perpendicularly to the axial direction at the side facing away from the impeller 20.

In the cross-sectional view in the axial direction shown in fig. 5B, the constriction 186 is shown as having a cross-sectional profile with an involute tooth profile.

In further embodiments, the constriction 186 may also have a triangular, trapezoidal, semicircular or semi-elliptical cross-sectional profile in cross-section in the axial and radial directions. It should be understood that other profile configurations of the constriction 186 are possible.

It should be understood that the various flow directing structures 18 disclosed herein, as well as other flow directing structures 18 not explicitly described, may be implemented in combination with one another. For example, the rotary shaft 10 may have at least one gas flow passage 182 and at least one gas flow channel 184, or the rotary shaft 10 may have at least one gas flow passage 182 and a constriction 186, thereby achieving a better cooling effect.

Although specific embodiments of the invention have been described in detail herein, they have been presented for purposes of illustration only and are not to be construed as limiting the scope of the invention. Various substitutions, alterations, and modifications may be devised without departing from the spirit and scope of the present invention.

List of reference numerals

10 rotating shaft

12 body

14 flange

16 connection structure

18 diversion structure

182 gas flow channel

182a first channel portion

182b second channel portion

182c first opening

182d second opening

184 gas flow channel

184a first channel portion

184b second channel portion

186 narrowed part

20 impeller

30 impeller volute

40 impeller end cover

50 adapter plate

60 case

70 casing end cover

S1 first space

S2 second space

Claims

1. A rotary shaft for an air compressor, the rotary shaft (10) being configured to be adapted to be connected to and drive a compression member for compressing air, wherein the rotary shaft (10) comprises a body (12) extending in an axial direction of the rotary shaft (10) and a flange (14) protruding radially outward from the body (12), characterized in that the rotary shaft (10) is provided at the flange (14) with a flow guiding structure (18), the flow guiding structure (18) being configured to enhance a gas flow through the rotary shaft (10).

2. The rotating shaft according to claim 1, wherein the flow directing structure (18) comprises at least one of:

at least one gas flow channel (182) formed in the rotating shaft (10);

at least one gas flow channel (184) formed at a surface of the rotating shaft (10); and

a constriction (186) of the flange (14) at an outer peripheral edge of the flange (14), the constriction (186) being formed such that a thickness of the flange (14) in the axial direction decreases in a radially outward direction at the constriction (186).

3. The rotating shaft according to claim 2, wherein the gas flow channel (182) comprises at least one of:

a first opening (182c) and a second opening (182d), wherein the first opening (182c) is provided at an outer circumferential surface of the flange (14), and the second opening (182d) is provided at a surface of the body (12); and

a first channel portion (182a) and a second channel portion (182b), wherein the first channel portion (182a) extends in the body (12) in the axial direction of the rotary shaft (10), the second channel portion (182b) extends in the flange (14) in the radial direction of the rotary shaft (10), and the first channel portion (182a) communicates with the second channel portion (182b) and forms an L-shaped gas flow channel (182).

4. A rotating shaft according to claim 3, wherein the second channel portion (182b) is centrally located in the flange (14) in the axial direction.

5. The rotating shaft according to claim 2, wherein the at least one gas flow channel (182) comprises at least two gas flow channels (182) arranged uniformly in a circumferential direction of the rotating shaft (10).

6. The rotating shaft according to claim 2, wherein the gas flow channel (184) comprises a first channel portion (184a) and a second channel portion (184b), wherein the first channel portion (184a) extends at the surface of the body (12) in an axial direction of the rotating shaft (10), the second channel portion (184b) extends at the surface of the flange (14) in a radial direction of the rotating shaft (10), and the first channel portion (184a) communicates with the second channel portion (184b) and forms an L-shaped gas flow channel (184).

7. The rotating shaft according to claim 2, wherein the at least one gas flow channel (184) comprises at least two gas flow channels (184) arranged uniformly in a circumferential direction of the rotating shaft (10).

8. The rotating shaft according to claim 2, wherein the constriction (186) is formed as at least one of:

at least partially surrounding the body (12) in a circumferential direction of the rotation shaft (10);

narrowing in a radially outward direction at least one of both sides in an axial direction; and

a cross-sectional profile having a triangular, trapezoidal, semicircular, semi-elliptical, or involute tooth profile in cross-section in the axial direction and the radial direction.

9. The rotating shaft according to any one of claims 1 to 8, wherein the rotating shaft (10) is a rotating shaft (10) for a centrifugal air compressor, and the flange (14) is provided adjacent to one end of the rotating shaft (10) connected to an impeller as a compression member.

10. An air compressor, characterized by comprising a compression part for compressing air, a rotary shaft (10) according to any one of claims 1 to 9 connected to and driving the compression part, and a housing accommodating the compression part and the rotary shaft (10).